Help, Vibration at 55 mph...

Hello. I have an 88 Cherokee Laredo that has a vibration from about 35 mph on up. Gets worse at about 55-65 mph. The whole Jeep shakes. I've replaced the steering stabilizer, front U-Joints, and front lower control arm bushings in an effort to solve this problem. I also had the alignment checked and the tires balanced. The vibration is still there. It's the type of vibration that seems like a classic tire balance issue, but I've already tried that and it was fine. Any help or suggestions would be greatly appreciated as I don't know what to check next. Please feel free to share your ideas and thoughts on how to solve this problem. Thanks.

Regards,

Reply to
Gary B.
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Bent Rim maybe?

Gary B. wrote:

Reply to
FrankW

A rear universal joint can cause this too.

Earle

Reply to
Earle Horton

I had one that drove me nuts in my 88. I did the same as you, checked everything.

Finally my fan shroud exploded.....

The clutch on my rad fan had given up the ghost.

Strangest damn vibration too. The whole drivetrain was shaking.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

"Gary B." wrote:

Reply to
Mike Romain

I had exactly the same type of problem with a 2000 wrangler. Replaced tires, re balanced twice , u-joints , rear drive shaft, nothing worked. Turned out a be a bent rear output shaft in the transfer case. Hope this helps.

JD

2K-TJ

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Reply to
JD

On Mon, 24 Nov 2003 19:20:52 GMT, the following appeared in rec.autos.makers.jeep+willys, posted by "Gary B." :

Everyone else had good suggestions, but you might also want to check the driveshaft (driveshaft*s* if you don't have lockout hubs). If it's gotten bent or lost one of the welded-on balancing weights it could cause the problem.

Hope you find it; this sort of thing can drive you nuts.

Reply to
Bob Casanova

Reply to
L.W.(ßill)

I got the strangest shimmy, real bad at 65, bad enough I was worried about losing a tie rod end or wheel bearing, all from that stupid fan clutch. I think it was pulsing the steering pump via the belt.

Mike

"L.W.(ßill) Hughes III" wrote:

Reply to
Mike Romain

Reply to
L.W.(ßill)

(ßill) said "or sound like the three speed thing your wife has hidden in the closet."

Talk about a vivid imagination... LOL

-- JimG

80' CJ-7 258 CID 35" BFG MT on 15x10 Centerlines D44 Rear, Dana 30 Front. SOA 4.56 Gears, LockRight F&R Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries

Reply to
JimG

The biggest problem is the shocks are shot. You can not tell unless you remove them from the jeep. Also the tires are out of round enough to get the vibration started. I had the exact same problem.

Good luck, Dave

Reply to
Dave K.

I had this on my TJ, where balancing did not help. I rotated the tires, front to back, and it went away. That might be a cheap short-term answer. Also on the Sienna the wifey bent a rim just a bit that caused a shudder over 65, put it on the back until I got a new rim and that mitigated the effect greatly. Tomes

Reply to
Tomes

Do you have a narrow cupping pattern on the inside margin/surface of your front tires???

If yes, Pull the bolts that attach the trac bar and inspect for deformation of the attachment bolts and the frame portion of the system. . The Right side uses a bolt whose threads will 'gall' into the frame attachment (Original vehicles came with a totally threaded bolt ... instead of a proper shoulder bolt/). The Left side attaches to a secondary frame mount and the attachment can 'egg' (deform). With both sides of the attachments deformed the play slop can 'add up'.

Do this test: key in ignition to unlock steering column, engine off, rotate the steering wheel back and forth while looking at a far distant object over the hood. If the far distance object is moving when you oscilate the steering wheel ..... probably excessive slop in the trac bar (or its attachments) - the relative soft tires will add a bit of side to side play when you oscilate. If you perceive more than just tire movement when you oscilate the steering wheel, have an assistant oscilate the steering wheel while you crawl under the vehicle and check/feel every connection of the trac bar .... *and its frame attachments*.

Been there..... drove me nuts until I found the problem *on the frame attachments* - galling of the bolt/frame and egg shaped hole on the subframe attachment. Acted JUST LIKE DEATH WOBBLE!!!!!!!

Hope this helps.

;-)

Reply to
Rich Hampel

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